IN IN9916DELNP2014A
A carrier- gas mixture is directed through a fluid flow path (16 , 18) in a combined heat and mass transfer device (12 , 14) which can be operated at sub -atmospheric pressure. Heat and mass are transferred from/ to the carrier- gas mixture via interaction with a liquid composition including a vaporizable component in a liquid state to substantially change the content of the vaporizable component in the carrier- gas mixture via evaporation or condensation. The mass flow rate of the carrier gas mixture is varied by extracting/injecting (60 , 62, 64) the carrier -gas mixture from at least one intermediate location in the fluid flow path , and/or the mass flow rate of the liquid composition is varied by extracting/injecting the liquid composition from at least one intermediate location in the fluid flow path. The flow of the carrier gas mixture or the liquid composition is regulated to reduce the average local enthalpy pinch.
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